From what I've heard from Knotfest apparently it's Lukas Magyar the vocalist from a band called Arms of Empire.
When VOM's previous vocalist Brandon Butler left he cited difference in opinion regarding the band's direction as a cause for the split. The first thing I thought was "VOM wants clean vocals" and if this video (drum playthrough of all things) is anything to go by their (supposed) new vocalist can both scream and sing. Make of that what you will.
I have never really gotten into Veil of Maya but I'm excited to hear this new direction as it may very well turn me into a fan.